/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: Admin
 * Date: 2022-11-10
 * Time: 17:47
 */
import java.util.*;
import java.math.*;

public class Demo1 {

    public static void main(String[] args) {
        Scanner scan  = new Scanner(System.in);

        while(scan.hasNext()) {
            BigDecimal a = scan.nextBigDecimal();
            BigDecimal b = scan.nextBigDecimal();
            BigDecimal c = scan.nextBigDecimal();

            if(a.add(b).compareTo(c) > 0 && a.add(c).compareTo(b) > 0 && b.add(c).compareTo(a) > 0) {
                System.out.println("Yes");
            }else {
                System.out.println("No");
            }

        }
    }
}
